Perhaps you should try some spelling variations:
su triet » su tien, ve triet
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
hanh va » hang va, hanh vi
vuc van » duc van, luc van, thuc van
su viet » so viet
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
va cao » va co, va dao, va bao
v nang » va nang, vu nang, van nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach v nang xa hoi. hieu ((va cao) or (va cac)) vuc van hanh va ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang xa hoi. hieu ((va cao) OR (va cac)) vuc van hanh va ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang xa hoi. hieu ((va cao) or (va cac)) vuc van hanh va ((su triet) OR (su viet))".
• Adding a wildcard symbol may retrieve word variants: te sach v nang xa hoi. hieu ((va cao) or (va cac)) vuc van hanh va ((su triet) OR (su viet))*.